# name: test/sql/json/issues/internal_issue3146.test
# description: Test internal issue 3146 - JSON parsing exception: Arrow datatype Map(Field ... ) not supported by Polars
# group: [issues]

# https://github.com/duckdblabs/duckdb-internal/issues/3146#issuecomment-2396148122

require json

statement ok
COPY (SELECT '{}') TO '__TEST_DIR__/empty_object.json' (FORMAT CSV, HEADER FALSE)

# for empty JSON objects we default to MAP(VARCHAR, JSON) as this is generic enough to fit any object
query I
SELECT typeof(json) FROM '__TEST_DIR__/empty_object.json'
----
MAP(VARCHAR, JSON)

# we can disable it with the map_inference_threshold parameter
query I
SELECT typeof(json) FROM read_json('__TEST_DIR__/empty_object.json', map_inference_threshold=-1)
----
JSON